Fluoroelastomer Centre

The Difference between FPM, FKM and Viton®

The terms FPM, FKM and Viton® very often cause confusion and lead to incorrect interpretations. All of these designations actually stand for one single base material:fluoro rubber.

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FPM is the international abbreviation according to DIN/ISO, whereas
FKM nis the short form for the fluoroelastomer category according to the American standard ASTM.
Viton® is the registered trade mark of DuPont Performance Elastomers.

 

Zrunek uses the designation FPM for all of its fluoro-elastomer materials.

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Fluoro rubber

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Both materials are well suited for use in the -30 to 125°C range. FKM has an advantage in lower temperatures and FKM has an advantage in higher temperatures. Marco offers specific compound formulations extending these ranges even futher as can be seen in the following compound comparison chart. When comparing these materials with respect to electrical current resistance, FKM has a slight advantage. The differences in compression set resistence show that FKM has a slight advantage. Additionally, FKM has a slight advantage when considering wear resistance. Also, FKM has a slight advantage when comparing heat stability. Furthermore, Buna-N has a slight advantage when comparing short term resilience. Finally, FKM has a slight advantage when evaluating differences in permeation resilience. Both materials are resistant to solvents, common fuels, mineral oils, vegetable oils, greases, aliphatic hydrocarbons, silicone oils, petroleum oils and di-ester lubricants, with Buna-N having specific resistences to acids, diluted alkalies, hydraulic fluids, water, ethylene glycol fluids and alcohols. FKM has specific resistence to steam, ozone, compression set, broad spectrum chemical resistance, aromatic hydrocarbons, chlorinated hydrocarbons, non-flammable hydraulic fluids, aging, strong acids, brake fluids, acetone, halogenated hydrocarbons, vacuum and most acids.